IVOLT

From the perspective of reliability design theory, since the driving power supply is much more complicated than the lamp bead, the number of electronic components in the power supply are many, and there are resistors, capacitors, inductors, diodes, triodes, mos tubes, etc., the more the number of types, the probability of failure The higher the power supply, the lower the probability of failure of the power supply is at least an order of magnitude higher than the lamp bead.
Since more than 80% of the energy of the LED lamp is converted to heat, the temperature of the lamp body is generally high, which requires a very high power supply, far exceeding the demanding base station power supply in the communication power supply, and the base station power supply is rarely fully loaded. And LED lights are rarely not fully loaded. High temperature and full load for a long time, this is a very demanding power supply.
However, in reality, there are very few companies that can do base station power, but manufacturers that do LED driver power are everywhere, and many of them are destined to design, for the materials they use are unreasonable and shoddy.

In reliability design, the most effective and most common way to improve reliability is to provide a backup method. The dual engine is the most classic method.In the communication system, the high-demand power system uses n+1 backup. These are the reliability enhancements that are faced with and accept the fact that the power supply is easily damaged.
In led luminaires, full power backup cannot be achieved due to constant current drive. However, the lamp bead can be divided into n groups, each group is separately powered by an independent power source, and a group of power sources fails, and the lamp does not have a fatal total extinction. The probability of simultaneous failure of n groups is extremely low.

1. Efficiency: Energy saving is the main selling point of LED lights, power conversion efficiency is not high, and even the best light beads can not produce high-efficiency lamps.
2. PF value: high PF value can effectively reduce reactive power loss, improve the utilization of AC power, save energy for power generation, reduce harmonic current, and reduce investment in power grid and power distribution equipment.
3. Temperature: Temperature has a decisive influence on the life of electronic components. Especially for electrolytic capacitors, the temperature drops by 10 degrees and the life is doubled.
4. Safety: Safety is vital.

Aluminum electrolytic capacitor operating temperature
If you choose 105 degrees, the high-frequency aluminum electrolytic capacitor with a life of 10,000 hours, according to the current aluminum electrolytic capacitor life estimation formula: the temperature "every 10 degrees reduction, the life doubled", then its working life in the 95 degree environment is 20000 Hours, working life in the 85 degree environment is 40,000 hours. Temperature and lifetime are exponential functions.

High efficiency is the overall energy saving requirement of LED lighting system, and it is the basis and guarantee for low temperature rise, long life and high reliability.
For example, if a 100W LED driver is used, the loss is 5.2W when the efficiency is 95%, and the loss is 17.6W when the efficiency is only 85%. The latter is 3.4 times of the former. Experiments show that under the same conditions, the former It is 10 to 15 ° C lower than the latter temperature. According to the principle that the temperature of the aluminum electrolytic capacitor drops by 10 degrees, the temperature is lowered by 10 degrees, and the life is doubled.

PF is the abbreviation of Power Factor, which refers to the power factor, which is the ratio of active power to apparent power. PFC is the abbreviation of Power Factor Corrector, which refers to power factor correction; high power factor can: 1) reduce current harmonics ; 2.) increase the power system capacity; 3) reduce line losses, save energy. Low power factor means low power efficiency. The lower the power factor, the higher the proportion of power is consumed in the distribution network. If the low power factor is not corrected, the power company has to provide more than the active power. Reactive power, which leads to the need for larger generators, transformers, power lines, etc. to compensate for losses.

1. The design is not in place: waterproof, lightning protection, EMC, the main is thermal design, the temperature range is lower than the actual temperature of the lamp;
2. The quality of the selected components is inferior: for example, using poor quality epoxy to do waterproof potting, ordinary electrolysis instead of high frequency electrolysis, high temperature electrolysis instead of high frequency electrolysis, refurbished components, disassembled parts and so on.